DC adjustable power supply, Fluke multimeter, Kill-a-Watt outlet meter, wire of various gauges, wire strippers, breadboard kit, label maker, project shelving or cubbies for people to store things between visits, whiteboard, a shop vac for the inevitable messes, calipers for making precise measurements, safety stuff (eyes, ears, hands, first aid kit), crafty supplies (tape, hot glue, pipe cleaners, popsicle sticks, twine/rope, markers, construction paper, play dough, Lego bricks), basic tool sets (wrench, screwdrivers, drills), misc screw and fasteners sets, velcro fasteners, heat set brass inserts super useful for 3d printing

And finally... a box for purchase requests and donations